ISO/IEC 27001:2022 requires an information security management system (ISMS), not a particular uptime tool or universal availability target. Monitoring evidence becomes relevant through the organization's scope, risk assessment, security objectives, treatment plan, service commitments, selected controls, and Clause 9.1 evaluation.
This guide maps operational monitoring to that management-system context. It distinguishes mandatory clauses from Annex A controls selected as applicable, and raw uptime data from the review records that show the ISMS acted on it. ISO's official ISO/IEC 27001:2022 overview describes the standard and availability as part of information security; use the licensed standard and your certification body for normative wording.
Put Monitoring Inside the ISMS
ISO/IEC 27001:2022 addresses monitoring at the management-system layer through Clause 9.1. Annex A is a reference set: controls such as A.8.16 matter when the risk-treatment process selects them as applicable and the Statement of Applicability records that decision.
Clause 9.1 — Monitoring, measurement, analysis, evaluation
Clause 9.1 requires the organization to determine what needs monitoring and measurement, the methods, timing, responsibilities, and how results are analysed and evaluated. Uptime may be one measure when availability is in scope, but the clause does not impose one universal uptime target.
Useful evidence can include defined metrics and owners, approved thresholds, a monitoring schedule tied to risk, review records, decisions, corrective actions, and retained results. Document names such as “measurement matrix” or “evaluation report” are implementation choices, not mandated ISO templates.
Annex A 8.16 — Monitoring activities
When selected, A.8.16 concerns monitoring for anomalous behaviour and acting on potential information-security events. Define the monitored signals, rationale, triage owner, and response path from the organization's risks; a generic ruleset without review or action evidence is weak support.
What auditors expect: what is monitored, why, what constitutes an anomaly, and what happens when one is detected — ideally with traceable examples from the audit period.
Annex A 8.6 — Capacity management
When selected, A.8.6 supports monitoring and adjustment of resource use against current and expected capacity needs. Pair uptime with internal utilization and demand trends; an outside-in probe cannot demonstrate capacity management by itself.
What auditors expect: resource utilisation trends and a capacity plan that shows you can absorb growth.
Annex A 8.14 — Redundancy
When selected, A.8.14 ties redundancy to the organization's availability requirements. Evidence can include architecture, failover configuration, tests, and observed behavior; a multi-region probe can test an outcome but does not prove the design has no single point of failure.
What auditors expect: redundancy configurations (multi-region or multi-AZ) and evidence the redundancy is real, not theoretical.
Annex A 5.30 — ICT readiness for business continuity
When selected, A.5.30 connects ICT readiness to business-continuity objectives. Relevant evidence can include plans, exercises, recovery results, and corrective actions.
What auditors expect: a disaster recovery plan and evidence of recovery testing.
The thread through all of these is evidence of operation. A control on paper that produced no records during the certification period is not a control that operated.
The Monitoring Evidence Auditors Expect
1. Continuous uptime records covering the full period
Where uptime is an approved metric or control, retain a sufficiently complete record for the defined retention period and audit scope. A data gap needs explanation and may expose a control failure when it conflicts with the organization's stated procedure; it is not automatically a nonconformity in every ISMS.
This may look like timestamped external checks, documented exclusions and maintenance, a retention window tied to policy, and a reviewed report comparing each in-scope service with its target.
2. Defined thresholds and an evaluation report
Clause 9.1 requires the organization to define what it will monitor and evaluate. If uptime is selected, document the target, owner, method, review cadence, and response to misses. Preserve evidence that the results were analysed and acted on; ISO/IEC 27001 does not mandate a document named “Evaluation Report.”
3. Alerting with someone accountable
Monitoring that fires alerts into a void does not count. Auditors look for alerting that someone is accountable for reviewing, and an on-call or escalation path that shows incidents were acknowledged and acted on. The evidence is the alert log plus acknowledgement and response timestamps.
4. Incident records with timelines
For every incident during the period, the auditor expects a record: when it was detected, who was notified, what was done, when it resolved, and the root cause. Teams that resolve incidents in chat without preserving a formal record are the most common source of findings. The fix is an incident management workflow that captures the timeline automatically.
5. Stakeholder communication records
A public or private status page can support a documented communication process, but it is not an ISO/IEC 27001 requirement. The relevant evidence is that the organization followed its own communication requirements during applicable incidents.
6. Post-incident reviews and recovery testing
Annex A 5.30 is about recovery, and the proof that recovery procedures work is a post-incident review for each significant outage plus documented DR test results. A pile of incidents with no reviews is a gap.
7. SSL, DNS, and domain health
Outages often come from upstream causes — an expired SSL certificate, DNS drift, or a lapsed domain. Monitoring these alongside uptime shows you are preventing incidents, which strengthens the A 8.16 and A 8.14 story.
Mapping ISO 27001 Clauses to Monitoring Evidence
| ISO 27001 clause | What the auditor wants | Monitoring evidence |
|---|---|---|
| 9.1 Monitoring | Metrics measured against targets | Uptime % vs. SLA, evaluation reports |
| A 8.16 Monitoring activities | Anomalies detected and acted on | Alert logs, incident records, response actions |
| A 8.6 Capacity | Resources monitored and forecast | Utilisation trends, capacity plan |
| A 8.14 Redundancy | Redundancy implemented and real | Multi-region checks, failover evidence |
| A 5.30 ICT readiness | Recovery planned and tested | DR plan, recovery test results, post-incident reviews |
| Availability SLA | Uptime commitment measured | Continuous uptime record for the full period |
The pattern is consistent: every clause maps to a record the monitoring tool produces automatically. The audit becomes a retrieval exercise instead of a reconstruction scramble.
Where External Monitoring Can Support the ISMS
External monitoring can produce inputs for selected availability and monitoring controls. The organization must still establish scope, objectives, risk treatment, review, action, retention, and control effectiveness.
- Continuous uptime records — multi-region checks logged across the certification period, so you can produce an uptime-percentage report per service on demand instead of reconstructing it from memory.
- Smart alerting with accountability — downtime confirmed from multiple regions before paging, and on-call scheduling with escalation, so every alert has an owner and an acknowledgement timestamp on the record, supporting A 8.16.
- Incident management with timelines — incidents captured with detection, notification, response, and resolution timestamps, plus post-incident review, which is exactly the evidence auditors request for A 5.30 and A 8.16.
- Communication records — optional public or private status updates when they implement the selected stakeholder-communication process.
- SSL, DNS, and domain monitoring — the upstream causes of outages monitored alongside uptime, strengthening the A 8.14 and A 8.16 evidence.
- Response time monitoring — performance trends that support the A 8.6 capacity story, showing the system stayed within acceptable bounds as demand changed.
- Heartbeat monitoring — for background jobs and scheduled tasks, covering the availability of components that active checks cannot reach.
ISO/IEC 27001 is broader than monitoring: it covers the ISMS and risk-based controls across people, process, physical, and technical domains. Uptime, alert, and incident records can support the availability story, but do not determine certification.
How to Prepare for an ISO 27001 Availability Audit
1. Define your uptime target and the services in scope
Write down the uptime target (for example, 99.9%) and which services it applies to. The auditor measures evidence against this specific commitment, so it has to be explicit and agreed with asset owners.
2. Stand up continuous monitoring across those services
Configure multi-region uptime checks for every in-scope service, with alerting routed to an on-call rotation. Make sure the retention window covers the certification period before the audit begins — evidence collected after the fact does not help.
3. Define thresholds and the evaluation cadence
Agree what "bad" looks like (uptime below 99.9%, response time above a threshold) and how often you will evaluate (daily automated, monthly manual review). Document the threshold and the cadence in your Measurement Matrix.
4. Operationalise incident records
Make sure every incident produces a record: detection time, notification, response, resolution, and a post-incident review. If your team resolves issues in chat, configure an incident workflow that captures the timeline automatically so you are not reconstructing it later.
5. Implement the communication control you selected
If the risk treatment or service commitments call for stakeholder updates, define the audience, trigger, owner, and retained evidence. A status page is one implementation, not a mandatory control.
6. Test recovery procedures
Schedule at least one DR test or tabletop exercise during the period and document the results. This is the A 5.30 evidence — without a test on record, the control did not operate.
7. Produce the evaluation report
At the planned intervals, produce an Evaluation Report showing uptime against target, incidents and their resolution, and any capacity or redundancy actions taken. Someone signs off. This is the Clause 9.1 evidence that turns raw data into a satisfied control.
Frequently Asked Questions
Does ISO 27001 require uptime monitoring?
Clause 9.1 applies to the ISMS. Annex A 8.16, A 8.14, and A 5.30 are reference controls whose applicability is determined through risk treatment and documented in the Statement of Applicability. If an uptime objective or commitment is in scope, define how it is measured, reviewed, acted on, and retained.
What monitoring evidence does ISO 27001 require?
Evidence depends on scope, risk treatment, objectives, selected controls, and documented procedures. For an uptime control it may include check history, targets, reviews, alerts, incidents, exceptions, and recovery tests for the applicable audit period and retention policy.
Is a status page required for ISO 27001?
No. A status page can implement part of a stakeholder-communication process, but the auditor evaluates the organization's scoped requirements and whether its chosen process operated.
What is the difference between monitoring and measuring under Clause 9.1?
Monitoring is collecting data; measuring is comparing it to a target. You can monitor a server for 24 hours, but if you do not measure its uptime against a target, you have not satisfied Clause 9.1. Auditors look for both the data and the evaluation against thresholds.
Can monitoring tools help with ISO 27001?
Yes, when their data maps to an ISMS metric, risk treatment, or selected control. The organization still has to define scope and ownership, evaluate results, retain required evidence, and address exceptions. Monitoring supports part of the ISMS; it does not determine certification.
Walk Into the Audit With Evidence Already Collected
Monitoring and measurement procedures need to operate as documented, and selected controls need evidence of operation. Build that record during the applicable period rather than trying to reconstruct it immediately before an audit.
Start uptime monitoring — free. Use timestamped external checks as one evidence source in the ISMS process defined by your organization.